package com.tangguo.vshop.security;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;
@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {
	@Autowired
    private UserDetailsService userDetailsService;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Value("${jwt.header}")
    private String tokenHeader;
    @Value("${jwt.tokenHead}")
    private String tokenHead;
	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
			throws ServletException, IOException {
		String authHeader = request.getHeader(this.tokenHeader);
		if(authHeader!=null&&authHeader.startsWith(tokenHead)){
			final String authToken = authHeader.substring(tokenHead.length()); // The part after "Bearer "
            String username = jwtTokenUtil.getUsernameFromToken(authToken);
            logger.info("checking authentication " + username);
            if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
                UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
                if (jwtTokenUtil.validateToken(authToken, userDetails)) {
                    UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(
                            userDetails, null, userDetails.getAuthorities());
                    authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(
                            request));
                    logger.info("authenticated user " + username + ", setting security context");
                    SecurityContextHolder.getContext().setAuthentication(authentication);
                }
            }
		}
		chain.doFilter(request, response);
	}

}
